Ukraine's Defense Minister Valeriy Heletey said Sunday weapons are on the way to Ukraine from Western countries - which he would not name - to help the country in its fight against Russian-backed rebels.

The claim came as sporadic fighting continued in eastern Ukraine, despite of a nine-day-old cease-fire.

Heletey said the shipments were agreed to in secret at the NATO summit 10 days ago. He said the new weapons will help Ukraine defend itself against potential Russian missile attacks from across the border.

The minister indicated the shipments include a missile-defense system capable of stopping any rockets launched toward Ukraine in what he called “a matter of seconds.”

Ukraine has accused Russia of launching artillery shells across the border, and of sending troops to support the rebels. Russia denies the charges.

Sporadic fighting

The Ukrainian defense minister’s comment came amid reports of some continuing fighting Sunday in the east, after an intense exchange of fire on Saturday at the airport outside the key rebel stronghold of Donetsk.

Ukrainian government forces control the airport.

Each side has accused the other of numerous violations of the cease-fire, which is supposed to pave the way for negotiations.

Ukraine, Russia and rebel representatives signed the accord on September 5, including a 12-point peace plan. But there are huge differences on what the outcome of the talks should be.

Ukraine wants its sovereignty restored and promises more regional autonomy in the east. Russia and the rebels want the area to be independent, or at least fully autonomous and able to establish strong links with Moscow.

Analysts say Russian President Vladimir Putin wants to be able to destabilize Ukraine any time he decides it is becoming too politically close to Western Europe.

But both sides have reasons to go to the negotiating table.

Negotiations

Ukrainian President Petro Poroshenko said he wants to stop the bloodshed, and analysts say he has realized Putin will not allow the separatists to lose on the battlefield.

Russian exile and military expert Igor Sutyagin, now at London’s Royal United Services Institute, said Putin wants to avoid further Western economic sanctions, which are already hurting the Russian economy.

“It was necessary to fix the situation, to force, and Putin openly said that, to force Kyiv to sit at the table and negotiate with the separatists,” he said.

In spite of the violations, the cease-fire in eastern Ukraine has significantly reduced the violence and casualties, and could provide a chance for the leaders to find a way out of the crisis.